[Sheriff] Disable flaky SearchActivityTest#testNewIntentDiscardsQuery

This CL disables the flaky test
SearchActivityTest#testNewIntentDiscardsQuery.

Bug: 1166647
Change-Id: I1a6edefbb2cb64bc9bf181a7fd9727822b651716
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628954
Auto-Submit: Alice Wang <aliceywang@chromium.org>
Commit-Queue: Peter Conn <peconn@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844006}

chrome/android/javatests/src/org/chromium/chrome/browser/searchwidget/SearchActivityTest.java

@@ -508,6 +508,7 @@ public class SearchActivityTest {
 
     @Test
     @SmallTest
+    @DisabledTest(message = "crbug/1166647")
     public void testNewIntentDiscardsQuery() {
         final SearchActivity searchActivity = startSearchActivity();
         setUrlBarText(searchActivity, "first query");